Note: In some versions of Chrome, you may not be able to remove players from the Blocklist or threads from Hidden Threads and Thread Exceptions. Resetting the script's settings also won't correctly work, however I know ways around setting storage issues. This is a listed bug in Chrome - https://bugs.chromium.org/p/chromium/issues/detail?id=765524.

Edit: due to when the player data was downloaded in comparrison of when you encountered the bug, I thought the bug was to do with player data not being downloaded. Turns out that the bug was to do with script storage data being read before it was defined (I.E. first time-only).